Kiriko (Hikari Mitsushima) and his brother Daigo (Takeru Shibuya) are watching 3D movie when a stuffed rabbit suddenly jumps out from the screen. Earlier Daigo violently took away the life of a rabbit inside a schoolyard, and Kiriko failed to stop his action in time.

Soon Daigo has been invited to enter a mysterious world, where a strange stairs appears in the storeroom every night. Kiriko feels that there is someone on the other side of the closet at home. She decides to follow a stranger dressed in a rabbit costume who suddenly arrives to take his brother away into an alternate world.